Nonideal behavior of the intramolecular structure factor of dilute polymers in a theta solvent

Kenji Shimomura, Hiizu Nakanishi, and Namiko Mitarai
Phys. Rev. E 80, 051804 – Published 30 November 2009

Abstract

We study the configurational properties of single polymers in a theta solvent by Monte Carlo simulation of the bond fluctuation model. The intramolecular structure factor at the theta point is found to be distinctively different from that of the ideal chain. The structure factor shows a hump around q5/Rg and a dip around q10/Rg in the Kratky plot with Rg being the radius of gyration. This feature is apparently similar to that in a melt. The theoretical expression by the simple perturbation expansion to the first order in terms of the Mayer function can be fitted to the obtained structure factor quite well, but the second virial coefficient cannot be set to zero.

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  • Received 28 June 2009

DOI:https://doi.org/10.1103/PhysRevE.80.051804

©2009 American Physical Society

Authors & Affiliations

Kenji Shimomura and Hiizu Nakanishi

  • Department of Physics, Kyushu University 33, Fukuoka 812-8581, Japan

Namiko Mitarai

  • Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

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Issue

Vol. 80, Iss. 5 — November 2009

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